Return 输入有效会员编号时未执行语句

Question

大家早上好，

因此，我尝试创建一个帐户 class，其扫描方法采用“虚拟”会员卡扫描，但是，当我在输入中输入有效 card_number字段 returns 另一个输入字段，但是如果我输入无效 card_number 它 returns 无效 ID

这是我的代码，请问我哪里出错了？

from enum import Enum
from abc import ABC, abstractmethod
import csv
import json
from datetime import datetime, timedelta, date

membersJsonPath = 'members.json'

class BookStatus(Enum):
  AVAILABLE, RESERVED, LOANED, LOST = 1, 2, 3, 4

class ReservationStatus(Enum):
  WAITING, PENDING, CANCELED, NONE = 1, 2, 3, 4

class AccountStatus(Enum):
  ACTIVE, CLOSED, CANCELED, NONE = 1, 2, 3, 4

class Account(ABC):
    def __init__(self, status=AccountStatus.ACTIVE):
        self.__id = self.scan_id()
        self.__status = status
        
    def scan_id(self):
      with open(membersJsonPath, 'r') as membersJson:
        data = json.load(membersJson)
        input_id = input("Please enter your member ID: ")
        for member in data['members']:
          if member['card_number'] == input_id:
            return ("Welcome, " + member['first_name'] + "!") 
          else:
            return "Invalid ID"

a = Account()
a.scan_id()

这是我从 CSV 文件创建的 json 文件的一部分

{
    "members": [
        {
            "\u00ef\u00bb\u00bfid": "1",
            "first_name": "Adelaide",
            "last_name": "Cunningham",
            "gender": "Female",
            "email": "a.cunningham@randatmail.com",
            "card_number": "13"
        },
        {
            "\u00ef\u00bb\u00bfid": "2",
            "first_name": "Charlie",
            "last_name": "Roberts",
            "gender": "Male",
            "email": "c.roberts@randatmail.com",
            "card_number": "22"
        },
        {
            "\u00ef\u00bb\u00bfid": "3",
            "first_name": "Eric",
            "last_name": "Cooper",
            "gender": "Male",
            "email": "e.cooper@randatmail.com",
            "card_number": "33"
        },
        {
            "\u00ef\u00bb\u00bfid": "4",
            "first_name": "Cadie",
            "last_name": "Hall",
            "gender": "Female",
            "email": "c.hall@randatmail.com",
            "card_number": "43"
        }
   ]
}

Answer 1

问题出在这个for循环中：

for member in data['members']:
    if member['card_number'] == input_id:
        return ("Welcome, " + member['first_name'] + "!") 
    else:
        return "Invalid ID"

这里，如果input_id等于第一个会员的卡号，则return是欢迎信息，否则"Invalid ID"。你想扫描所有的卡号，只有 return "Invalid ID" 如果 none 匹配，所以第二个 return 语句应该在 for 循环结束之后：


for member in data['members']:
    if member['card_number'] == input_id:
        return ("Welcome, " + member['first_name'] + "!") 
    
return "Invalid ID"

Return 输入有效会员编号时未执行语句

Return statement not executed when valid member number is entered

python

methods

json

class

file